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feat: sample - Get dataset properties (#98)
* feat: sample - Get dataset properties

* nit: update

* update base on comments
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stephaniewang526 committed Jan 14, 2020
1 parent f41a53c commit 743bc0a552875b773becbd517a063e29193a6b49
Showing with 128 additions and 0 deletions.
  1. +63 −0 samples/src/main/java/com/example/bigquery/GetDatasetInfo.java
  2. +65 −0 samples/src/test/java/com/example/bigquery/GetDatasetInfoIT.java
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/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.example.bigquery;

import com.google.api.gax.paging.Page;
import com.google.cloud.bigquery.BigQuery;
import com.google.cloud.bigquery.BigQuery.TableListOption;
import com.google.cloud.bigquery.BigQueryException;
import com.google.cloud.bigquery.BigQueryOptions;
import com.google.cloud.bigquery.Dataset;
import com.google.cloud.bigquery.DatasetId;
import com.google.cloud.bigquery.Table;

// [START bigquery_get_dataset]
public class GetDatasetInfo {

public static void runGetDatasetInfo() {
// TODO(developer): Replace these variables before running the sample.
String projectId = "MY_PROJECT_ID";
String datasetName = "MY_DATASET_NAME";
getDatasetInfo(projectId, datasetName);
}

public static void getDatasetInfo(String projectId, String datasetName) {
try {
// Initialize client that will be used to send requests. This client only needs to be created
// once, and can be reused for multiple requests.
BigQuery bigquery = BigQueryOptions.getDefaultInstance().getService();
DatasetId datasetId = DatasetId.of(projectId, datasetName);
Dataset dataset = bigquery.getDataset(datasetId);

// View dataset properties
String description = dataset.getDescription();
System.out.println(description);

// View tables in the dataset
// For more information on listing tables see:
// https://javadoc.io/static/com.google.cloud/google-cloud-bigquery/0.22.0-beta/com/google/cloud/bigquery/BigQuery.html
Page<Table> tables = bigquery.listTables(datasetName, TableListOption.pageSize(100));

tables.iterateAll().forEach(table -> System.out.print(table.getTableId().getTable() + "\n"));

System.out.println("Dataset info retrieved successfully.");
} catch (BigQueryException e) {
System.out.println("Dataset info not retrieved. \n" + e.toString());
}
}
}
// [END bigquery_get_dataset]
@@ -0,0 +1,65 @@
/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.example.bigquery;

import static com.google.common.truth.Truth.assertThat;
import static junit.framework.TestCase.assertNotNull;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

public class GetDatasetInfoIT {
private ByteArrayOutputStream bout;
private PrintStream out;

private static final String GOOGLE_CLOUD_PROJECT = System.getenv("BIGQUERY_PROJECT_ID");
private static final String BIGQUERY_DATASET_NAME = System.getenv("BIGQUERY_DATASET_NAME");

private static void requireEnvVar(String varName) {
assertNotNull(
"Environment variable " + varName + " is required to perform these tests.",
System.getenv(varName));
}

@BeforeClass
public static void checkRequirements() {
requireEnvVar("GOOGLE_CLOUD_PROJECT");
requireEnvVar("BIGQUERY_DATASET_NAME");
}

@Before
public void setUp() {
bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
}

@After
public void tearDown() {
System.setOut(null);
}

@Test
public void getDatasetInfo() {
GetDatasetInfo.getDatasetInfo(GOOGLE_CLOUD_PROJECT, BIGQUERY_DATASET_NAME);
assertThat(bout.toString()).contains("Dataset info retrieved successfully.");
}
}

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